Back to all buyer's guidesBattery charger, starter motor and alternator for reliable winter starts
When the cold hits, you want to be able to rely on your machines starting – every time.
A weak battery, a worn starter motor or an alternator that does not charge properly can cost both time and money. We help you choose the right components for a safe and trouble-free winter. Whether you operate a tractor, wheel loader, forestry machine or any other equipment, we have the solutions that keep you running when it matters most.
FAQ / Frequently asked questions and answers
Battery Chargers
A battery that isn’t properly charged quickly loses capacity, especially when machines sit unused for longer periods. A reliable battery charger keeps the battery healthy, fully charged, and ready – reducing the risk of starting problems when you need the machine the most.
What to consider:
- Correct charging current (A): Larger tractors or construction machines require a charger with enough amperage for efficient charging.
- Automatic maintenance charging: Smart chargers adjust the charging process automatically and can stay connected for long periods without risk of overcharging.
- Compatibility: Check that the charger supports your battery type—such as AGM, gel, or traditional lead-acid.
- Safety features: Reverse polarity protection, overheating protection, and short-circuit protection make charging safer for both battery and machine.
A quality battery charger is the easiest way to extend battery life and ensure your machine starts reliably—year-round.
Starter Motor
A failing starter motor often shows signs only when it’s already too late. Cold engines require more power to turn over, and the starter motor must perform at its best to get the machine running.
Important to consider:
- Power and torque: A more powerful starter motor provides more reliable starts in cold conditions.
- Match the correct machine model: The wrong starter motor can cause overload or poor performance.
- Replace in time: Weak cranking, clicking sounds and slow starts are typical warning signs.
- Combine with a healthy battery: A good battery without a good starter motor – or vice versa – won’t help in cold weather.
With a quality starter motor from Olsson Parts, you avoid uncertain mornings and costly downtime.
Alternator
The generator charges the battery during operation and is essential for ensuring that the electrical systems function properly in machines that run for long hours – especially in winter, when lights, heating and electronics place extra load on the system.
How to choose the right alternator:
- Check the amperage: Do you have a lot of electrical equipment? Choose a generator that can handle the load.
- Stable charging in cold conditions: Modern generators are designed to provide stable output even in sub-zero temperatures.
- Replace before it fails: Flickering lights, battery warning indicators and weak electronics are early signs.
- Correct mounts and connectors: Ensure the generator is compatible with your machine’s engine series
A reliable generator makes the entire electrical system more robust and reduces the risk of unexpected machine shutdowns.
Why choose Olsson Parts?
Large stock – we have the parts when you need them
High quality – at the right price
Secure payment – safe and easy online
Expert support – we help you every step of the way
Tinkering tips with Olsson Parts
You sometimes need to see how someone else completes a task in order to be able to do it yourself. We have several tinkering tips where we show you everything from how to install a multi-coupler to how to check and change spreader tips. See all our tinkering tips here.
Tinkering tips with Olsson Parts – Replacing the starter battery
In this video, tractor mechanic Stefan Hildingsson replaces the starter battery and the battery cut off switch, as well as the cabling between the two, on his Volvo BM 800. You will also receive advice on things to consider when ordering a new battery and related parts for your tractor.
Tinkering tips with OlssonParts – Before replacing the starter motor and generator
Tractor mechanic Stefan Hildingsson shares his tips on what to consider when replacing a starter motor and generator.
Ready for winter? We've got the parts!
At Olsson Parts, you’ll find everything you need to give your machines a reliable and trouble-free winter. With a large stock and parts that fit most models, we make it easy to keep everything running.
Tip: Upgrade your battery + check the wiring + replace a weak starter motor = maximum reliability all winter.
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FAQ / Frequently Asked Questions – Battery Chargers, Starter Motors and Generators
How do I know if I need a battery charger?
If the machine starts sluggishly, the battery often feels weak, or the machine sits unused for longer periods, it’s a clear sign that the battery isn’t receiving enough charge. A battery charger helps keep the battery healthy and ready.
What charging current (A) should I choose for my battery charger?
Larger tractors and construction machines have bigger batteries and often require a charger with higher amperage. A charger that is too weak will take a long time to charge a large battery – choose based on the battery size in your machine.
Should I choose a smart charger, maintenance charger or traditional charger?
Smart chargers are usually the best option. They monitor the battery’s condition and adjust the charge automatically, preventing overcharging. Maintenance chargers are ideal for machines that stand still for long periods. Traditional chargers work but often lack protective functions.
How do I know if the battery charger is compatible with my battery?
Most modern chargers work with AGM, gel and lead-acid batteries, but always check the specifications. The wrong charger can shorten battery life or charge inefficiently.
Can I leave the battery charger connected all the time?
Yes – if it’s a smart charger with a maintenance mode. It keeps the battery at optimal levels without overcharging and is perfect for machines used infrequently.
How long does it take to charge a machine battery?
It depends on the battery size and the charger’s amperage. A stronger charger reduces charging time significantly. Machine batteries can take anywhere from a few hours to more than a day with weaker chargers.
What are the signs that the starter motor is failing?
Clicking noises, uneven starting, slow rotation or no response at all. These problems often become more noticeable in cold weather when the starter motor must work harder.
How do I know which starter motor fits my machine?
Match the starter motor exactly to your machine model and engine type. The wrong model can cause overload or insufficient power. Olsson Parts offers machine-based filtering and compatibility support.
Is replacing the starter motor enough if the machine starts poorly?
Not always. The starter motor and battery work together – a weak battery affects even a new starter motor. Always check the entire electrical system, including wiring and charging.
How do I know if the generator isn’t charging properly?
Warning lights, dim lighting, malfunctioning electronics or recurring dead batteries are typical signs. Generators often lose capacity gradually.
What size generator do I need?
It depends on how much electrical equipment the machine has. Extra lighting, aftermarket systems and heavy-duty use require a generator with higher amperage. Always check that mounts and connectors match the engine series.
How can I avoid electrical problems in winter?
- Keep the battery fully charged with a smart charger
- Check wiring and grounding points
- Replace the starter motor at early warning signs
- Ensure the generator is charging properly
- Keep battery terminals clean and free from corrosion
A healthy battery, proper charging and a good starter motor provide maximum reliability.
Why should I buy my parts from Olsson Parts?
We offer a large stock, high-quality parts at good prices, and experts who know tractors, construction and forestry machines. We support you all the way – from choosing the right part to installation tips in our guides.
Do you have parts for my machine model?
Yes! Our range covers most tractors, wheel loaders, forestry machines and construction equipment on the Swedish market. You can search by machine model or contact us for help.
How quickly will I receive my parts?
We ship quickly from our large warehouse – if you order before 2 p.m. CET, your order is usually shipped the same day. Perfect when you need to get your machine running again fast.
Do you have a question?
Here we have collected common questions and answers.
Can’t find the answer to your question? Don’t hesitate to contact us!
FAQ / Frequently Asked Questions